You may be wondering what is the best material for a flat roof? Roofing tiles are not a feasible option. However, the best materials for flat roofs in the UK are felt, EPDM rubber, and fibreglass (GRP).
Each option has unique properties and histories, making them suited to different types of buildings and budgets. Let us take a look:
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Felt Roofing
Description:
Felt roofing, typically made of layers of bitumen felt sheets reinforced with polyester or fibreglass, is a long-standing option for flat roofs. The felt is applied in layers, often with hot bitumen or a blowtorch, creating a watertight barrier.
History:
Felt roofing was first introduced in the early 20th century as a solution for flat and low-pitched roofs. The material’s popularity grew after World War II, especially in the UK, as an affordable option for garages, sheds, and outbuildings. While earlier versions of felt roofing had durability issues, modern advancements have significantly improved its longevity and resistance to weathering.
Benefits:
Affordability: Felt roofing is generally one of the most cost-effective options for flat roofs.
Ease of Installation: Installation is straightforward, allowing for quick repairs and reapplications.
Water Resistance: Modern felt systems are more resistant to water pooling, which is common on flat roofs.
Availability: Widely available and easy to source, making it a popular choice for budget-conscious projects.
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EPDM Rubber Roofing
Description:
EPDM (Ethylene Propylene Diene Monomer) rubber roofing is a single-ply membrane made from a synthetic rubber compound. It’s installed in large sheets, which reduces the number of seams and, subsequently, potential leak points.
History:
EPDM was developed in the 1960s as a versatile roofing solution for commercial buildings in the US, and it quickly spread to other countries, including the UK. Its durability and resilience in a wide range of temperatures made it an ideal choice for flat roofs. EPDM’s use has expanded from commercial applications to residential flat roofs, where it’s valued for its long lifespan and low maintenance needs.
Benefits:
Longevity: EPDM can last 30–50 years with proper maintenance, outlasting many traditional materials.
UV and Weather Resistance: EPDM is highly resistant to UV radiation and extreme temperatures, making it suitable for the UK’s variable weather.
Ease of Repair: EPDM is easy to repair, as patches can be applied to any damaged sections.
Eco-Friendly: Often recyclable and energy-efficient, EPDM has a relatively low environmental impact compared to other synthetic materials.
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Fibreglass (GRP) Roofing
Description:
Fibreglass, or Glass Reinforced Plastic (GRP), is a composite material created by mixing glass fibres with polyester resin. It forms a seamless, waterproof, and rigid layer when applied to a flat roof, usually over a timber deck.
History:
Fibreglass originally was in use in the 1930s and became popular in various industries due to its high strength-to-weight ratio. It was great for roofing in the latter half of the 20th century, with particular popularity in the 1970s and 80s in the UK. Furthermore, GRP has since become a common material for flat roofing on residential properties, especially for extensions and conservatories.
Benefits:
Durability: GRP roofs can last over 25 years if using the correct installation and maintenance.
Seamless Finish: Applied as a single, continuous layer, GRP roofing eliminates seams, reducing the risk of leaks.
Customisable Finish: Available in various colours and textures, GRP allows for some aesthetic customisation.
Low Maintenance: Once on, fibreglass roofs require minimal maintenance, making them convenient for homeowners.
Summary Comparison
| Roofing Material | Typical Lifespan | Key Benefits | Maintenance |
| Felt | 10–20 years | Affordable, easy to install | Moderate |
| EPDM Rubber | 30–50 years | Durable, UV-resistant, eco-friendly | Low |
| Fibreglass (GRP) | 25+ years | Seamless, customisable finish | Low |
Choosing the Best Material
Felt is a good option for budget-friendly, short-term projects or where affordability is the priority.
EPDM Rubber is best for those seeking a long-lasting, low-maintenance solution that can withstand the UK’s varied climate.
Fibreglass (GRP) offers a premium, seamless finish and durability, suitable for homeowners looking to invest in quality and aesthetic.
Each material has its advantages. Thus, the best choice depends on your budget, the roof’s purpose, and your maintenance preferences.
If you are searching for the very best materials for your flat roof, we are available to assist. As such, you will be spoilt for choice when you visit any of our branches at North East Roofing Supplies. Furthermore, you can also choose from the very best brand names offering top-quality products.
And that is not all! Our prices are excellent value for money and our customer service is brilliant. Moreover, each member of our team has years of experience and excellent product knowledge. Thus, if you have any queries, you are more than welcome to ask.
